What is the flame index of insulation?

The flame index of insulation is a critical rating that helps determine the material's fire safety performance. In this context, a flame index of 25 indicates that the insulation material has been tested and classified to have a moderate level of flame spread resistance. This means that it will not support combustion at levels higher than this index, making it suitable for various applications where fire safety is a concern. The rating helps in comparing different materials and selecting appropriate insulation that complies with safety regulations.

Insulation with a flame index of 25 balances adequate thermal resistance while ensuring that it does not contribute significantly to fire hazards within buildings. This allows it to be used effectively in construction while meeting fire safety standards required in many building codes.